Water-cooled engine rear head cooling via water floating ports
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Solution Overview
Problem
The cooling performance of the rear end-side head portion in water-cooled engines is often deteriorated due to insufficient floating of engine cooling water from the cylinder jacket to the rear end-side jacket portion of the head jacket.
Innovation Solution
The water-cooled engine incorporates a configuration where the cooler water supply pipe is led out from the rear end-side jacket portion, allowing engine cooling water to float from the cylinder jacket to the head jacket via water floating ports, and utilizing the water pump's absorbing force to enhance water circulation and cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cooler water supply pipe is led out from the front end-side jacket portion, then the cooling water circulation is simplified, but the cooling performance of the rear end-side head portion deteriorates due to insufficient floating of cooling water
Solution Approach 1:
The patent changes the spatial dimension of the cooler water supply pipe outlet from the conventional front end-side jacket portion to the rear end-side jacket portion. This dimensional change in the pipe configuration enables cooling water to be supplied directly to the rear end-side head portion, resolving the insufficient cooling issue without significantly increasing overall system complexity.
2Temperature
If the passage sectional area of water floating ports is reduced to improve cooling, then the cooling performance increases, but the passage resistance of the cooling water circulation path increases
Solution Approach 1:
The patent extracts the cooling function for the rear end-side head portion from the general cooling water circulation and creates a dedicated cooling path through the cooler water supply pipe led out from the rear end-side jacket portion. This allows sufficient cooling water supply to the rear end without requiring reduction of water floating port areas, thus maintaining low passage resistance.
3Temperature
If a large amount of cooling water is supplied to the rear end-side jacket portion, then the cooling performance improves, but the device complexity increases
Solution Approach 1:
The cooler water supply pipe led out from the rear end-side jacket portion serves multiple functions: it supplies cooling water to the oil cooler, provides cooling water to the rear end-side head portion through the rear end-side jacket portion, and utilizes the water pump's suction force to draw cooling water through the rear end-side water floating port. This multi-functionality achieves improved cooling without significant complexity increase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly improves the cooling performance of the rear end-side head portion by ensuring a large amount of engine cooling water is effectively circulated, reducing passage resistance in the cooling water circulation path, and enhancing overall engine cooling performance.
Implementation Method 1
since a water absorbing force of the water pump (8) is applied to the rear end-side jacket portion (2ba) via the cooler drain pipe (21), the oil cooler (19), and the cooler water supply pipe (20) in this order, a large amount of engine cooling water (9) is sucked up from the rear end-side water floating port (18a) to the rear end-side jacket portion (2ba)
Implementation Method 2
engine cooling water (9) floats from the cylinder jacket (2a) to the head jacket (2b) via the plurality of water floating ports (18)
Implementation Method 3
an oil cooler (19) that is cooled with water
Data Source
Figure 1
Figure 2
Figure 3(A)~3(C)
AI summary
Provided is a water-cooled engine in which cooling performance of a rear end-side head portion 17a is improved. A plurality of water floating ports 18 opened on a peripheral side of each cylinder 16 is provided between a cylinder jacket 2a and a head jacket 2b. Engine cooling water 9 floats from the cylinder jacket 2a to the head jacket 2b via the plurality of water floating ports 18. The head jacket 2b includes a rear end-side jacket portion 2ba facing a rear end-side water floating port 18a in the rear end-side head portion 17a of a cylinder head 17 among the plurality of water floating ports 18. An oil cooler 19 that is cooled with water, a cooler water supply pipe 20 from the head jacket 2b to the oil cooler 19, and a cooler drain pipe 21 from the oil cooler 19 to a water pump 8 are provided. The cooler water supply pipe 20 is led out from the rear end-side jacket portion 2ba.